X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2A%2Fsubstitution%2Fdrop_append.ma;h=16fb627ad937686431ee4a56befd2a8a1c18435d;hb=68b4f2490c12139c03760b39895619e63b0f38c9;hp=49d734ceaebd0ccc355ef2a7e7c4b7d993dd86e7;hpb=d2545ffd201b1aa49887313791386add78fa8603;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2A/substitution/drop_append.ma b/matita/matita/contribs/lambdadelta/basic_2A/substitution/drop_append.ma
index 49d734cea..16fb627ad 100644
--- a/matita/matita/contribs/lambdadelta/basic_2A/substitution/drop_append.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2A/substitution/drop_append.ma
@@ -12,6 +12,7 @@
 (*                                                                        *)
 (**************************************************************************)
 
+include "ground/lib/arith_2a.ma".
 include "basic_2A/grammar/lenv_append.ma".
 include "basic_2A/substitution/drop.ma".